EP0569920A1 - Portable device for thermal stimulus sensitivity tests - Google Patents

Portable device for thermal stimulus sensitivity tests Download PDF

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Publication number
EP0569920A1
EP0569920A1 EP93107617A EP93107617A EP0569920A1 EP 0569920 A1 EP0569920 A1 EP 0569920A1 EP 93107617 A EP93107617 A EP 93107617A EP 93107617 A EP93107617 A EP 93107617A EP 0569920 A1 EP0569920 A1 EP 0569920A1
Authority
EP
European Patent Office
Prior art keywords
temperature
held
probe elements
probe
patient
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP93107617A
Other languages
German (de)
English (en)
French (fr)
Inventor
Jean-Philippe Assal
Salvatore Bellinvia
Marino Massarotti
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Fidia SpA
Original Assignee
Fidia SpA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Fidia SpA filed Critical Fidia SpA
Publication of EP0569920A1 publication Critical patent/EP0569920A1/en
Withdrawn legal-status Critical Current

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    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00—Measuring for diagnostic purposes; Identification of persons
    • A61B5/48—Other medical applications
    • A61B5/4824—Touch or pain perception evaluation
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00—Measuring for diagnostic purposes; Identification of persons
    • A61B5/48—Other medical applications
    • A61B5/4824—Touch or pain perception evaluation
    • A61B5/4827—Touch or pain perception evaluation assessing touch sensitivity, e.g. for evaluation of pain threshold
    • A61B5/483—Touch or pain perception evaluation assessing touch sensitivity, e.g. for evaluation of pain threshold by thermal stimulation

Definitions

  • Portable device for thermal stimulus sensitivity tests in particular for tests in patients affected by neuropathies of diabetic origin, comprising four detecting probes arranged in a single block provided with a handgrip; each of said probes has a circular metallic outer surface to be placed in contact with the patient's skin and is held by its own control circuit at a pre-set temperature.
  • the device allows performance of a complete series of significant tests capable of supplying in a very short time (on the order of a few minutes) a reliable evaluation of the patient's sensitivity.
  • Thermal stimulus sensitivity tests are one of the means used in the medical field to verify the peripheral sensitivity of a patient, making evident any neuropathies.
  • a region considered significant, e.g. a malleus, of the cutaneous surface of the patient being examined and on which are rested in rapid succession two bodies, e.g. two probe elements, having different temperatures is stimulated thermally and the patient's ability to discriminate between the two temperatures is appraised.
  • the minimum temperature difference which the patient is able to detect is named 'thermal perception threshold'.
  • thermal perception threshold is much higher than that found in patients (including diabetic) who are not neuropathic: in fact in these patients there is observed a progressive reduction of thermal sensitivity which can reach total loss of sensitivity, exposing the neuropathic patient, among other things, to the risk of suffering burns or other lesions, even serious, accidentally and unknowingly.
  • a sealed box usually parallelepiped in shape of small dimensions (on the order of a few centimetres) provided with a handgrip for more convenient handling of the device and with at least one probe element (preferable cylindrical) projecting from said box and terminating with a metal cap which is placed in contact with the patient's skin to supply the thermal stimulus used for evaluating the sensitivity.
  • the surface of the metal cap is on the order of 5cm2.
  • the outer structure of the sealed box and the side parts of the probe elements on said box are made of electrically and thermally insulating material.
  • Each probe element contains an independent electrical heating and temperature control circuit of a known type for equipment of this type. To satisfy safety standards in force for this type of equipment the heating and control circuits located in the probe elements are low voltage circuits.
  • the device for thermal sensitivity tests comprises said sealed box bearing at least one probe element connected by an electric cable to a box containing at least one transformer for supplying with low voltage said electric and/or electronic heating and temperature control circuits of each of the probe elements present on said box, the main switch and one or more warning lights.
  • Said box is connected to the power supply network by a connection cable.
  • the known devices comprise a single probe element which can operate at two pre-set temperatures in the range used for the test by acting on the related electric heating and temperature control device.
  • the device comprises three probe elements designed to operate at three different fixed temperatures and a fourth probe element which can be made to operate at a temperature selected from a pre-set range.
  • the temperature values of the first three probe elements are 25°C, 42°C and 50°C respectively while the temperature of the fourth element can be varied in a range of 10°C (and in particular between 25°C and 35°C).
  • the related electric and/or electronic heating and temperature control circuits are controlled by a potentiometer or a "step-by-step" switch or other equivalent means.
  • Temperature variations in the probe elements induced by contact with the patient's skin are rapidly cancelled by the related heating and control circuits restoring in a very short time the pre-set temperature of the probe element (e.g. for the 50°C probe there is a maximum restoration time of 10"). This allows performance of the tests at a certain temperature and very short intervals.
  • the sealed box 5 is shown provided with a handgrip 6, the four probe elements 1,2,3,4 and the electric cable 7 which connects it to the box 8 containing at least a transformer for supplying low voltage to the electric and/or electronic heating and temperature control circuits of each of the four probe elements 1,2,3,4 present on the box 5, the main switch (not shown in the figure), the switch 9 (or other equivalent means) for selecting temperature of the fourth probe element 4, at least one warning light 10 and the cable 11 which connects it to the power supply network.
  • thermometer which measures their temperature instant by instant.
  • the temperatures thus taken are displayed on the corresponding display 12,13,14,15, located on the box 8, which allow the operator to verify before making a test that the probe elements to be used for the test have the required temperatures.
  • a first probe element 1 is held at the temperature (e.g. 25°C) taken as reference temperature for the test, two further probe elements 2,3 are held at the temperatures (e.g. 29°C and 32°C) respectively corresponding to the thermal perception threshold value of neurologically unharmed patients belonging to two age classes, while the fourth probe element 4 can reach two pre-set temperatures spanning the pain threshold (temperature exceeding which the heat sensation perceived by the patient is replaced by a painful sensation analogous to that produced by a burn).
  • the fourth probe element 4 is held at 42°C or 50°C.
  • test procedure performed by a device provided in accordance with the present invention.
  • the procedure is interrupted when a test is positive, i.e. when the patient perceives the temperature difference between the two probe elements applied to the same body region (e.g. one of the mallates).
  • body region e.g. one of the mallates.
  • test For a diabetic patient not over 60 years of age the first test is performed with probe elements at 25°C and 29°C (hereinafter called '25/29 test'). If the test is positive the patient is neurologically unharmed, otherwise the following test is performed.
  • the patient is a risk patient. He does not evidence neurological lesions but is to be kept under control. If the test is negative the patient can be considered neuropathic. To define the gravity of the neuropathy the following tests are orderly performed: if the 25/42 test is positive, the patient has a serious neuropathy and requires attentive care; if the 25/42 test is negative and the 25/50 test is positive, the patient displays a very serious neuropathy and requires especially attentive and assiduous care; if the test is negative the neurological situation of the patient is seriously compromised: in fact, as there is no sensitivity to heat and/or pain (at least locally), the patient is not able to notice if he comes accidentally in contact with flames and/or very hot surfaces and react before suffering even very serious burns.
  • the 25/29 test is not significant and is therefore omitted (reducing thus the time required for the examination) and the 25/32 test is performed first. If this test is positive the patient is neurologically unharmed but otherwise the subsequent tests are performed following the above described procedure.

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  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Pain & Pain Management (AREA)
  • Engineering & Computer Science (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Psychiatry (AREA)
  • Biophysics (AREA)
  • Pathology (AREA)
  • Hospice & Palliative Care (AREA)
  • Biomedical Technology (AREA)
  • Physics & Mathematics (AREA)
  • Medical Informatics (AREA)
  • Molecular Biology (AREA)
  • Surgery (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Measuring And Recording Apparatus For Diagnosis (AREA)
EP93107617A 1992-05-15 1993-05-11 Portable device for thermal stimulus sensitivity tests Withdrawn EP0569920A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITMI920481U 1992-05-15
ITMI920481U IT226580Z2 (it) 1992-05-15 1992-05-15 Dispositivo portatile per effettuare test di sensibilita' agli stimoli termici

Publications (1)

Publication Number Publication Date
EP0569920A1 true EP0569920A1 (en) 1993-11-18

Family

ID=11362244

Family Applications (1)

Application Number Title Priority Date Filing Date
EP93107617A Withdrawn EP0569920A1 (en) 1992-05-15 1993-05-11 Portable device for thermal stimulus sensitivity tests

Country Status (3)

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US (1) US5373853A (it)
EP (1) EP0569920A1 (it)
IT (1) IT226580Z2 (it)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2844175A1 (fr) * 2002-09-05 2004-03-12 Marie Souffrant Dispositif pour tester la sensibilite thermique d'un patient
WO2005018452A1 (de) * 2003-07-24 2005-03-03 Michael Schweers Vorrichtung und verfahren zur messung sensibler störungen unter berücksichtigung verschiedener unweltbedingungen
EP2312999A4 (en) * 2008-07-17 2013-01-09 Electronic Products Accessories And Chemicals Llc DEVICE FOR DIAGNOSING NEUROPATHIES
WO2017046735A1 (en) * 2015-09-16 2017-03-23 Meteda S.R.L. Apparatus for the evaluation of the discrimination and heat sensitivity in diabetes patients
US9610039B2 (en) 2008-07-17 2017-04-04 Prosenex, LLC Hand-held neuroscreening device

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5941833A (en) * 1997-06-04 1999-08-24 Neuroscience Toolworks, Inc. Heatbeam dolorimeter for pain and sensory evaluation
WO2005006968A1 (en) * 2003-07-16 2005-01-27 Koninklijke Philips Electronics N.V. A portable electronic device and a health management system arranged for monitoring a physiological condition of an individual
US8029553B2 (en) * 2004-03-02 2011-10-04 Mikhall Nemenov Portable laser and process for pain research
ATE424761T1 (de) * 2005-03-22 2009-03-15 Koninkl Philips Electronics Nv Vorrichtung und verfahren zum automatischen prüfen der temperaturempfindlichkeit eines patienten
US20110318700A1 (en) * 2009-06-12 2011-12-29 Mark A Stepovich Method and Apparatus for Dental Thermal Sensitivity Tester
US20120322022A1 (en) * 2011-06-16 2012-12-20 Garbin Development Tooth vitality tester

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3274995A (en) * 1963-07-09 1966-09-27 Eidus William Thermoelectric dental probe
EP0364158A1 (en) * 1988-10-11 1990-04-18 Ici Americas Inc. Tactile discrimination device and its use in assessing neurological function
EP0428125A1 (en) * 1989-11-16 1991-05-22 FIDIA S.p.A. Device for performing diagnostic tests on the sensitivity to thermal stimuli

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4653507A (en) * 1983-09-30 1987-03-31 Pfizer Inc. Differential thermal testing apparatus and method
US4763666A (en) * 1986-04-22 1988-08-16 Max-Planck-Gesellschaft Zur Foerderung Der Wissenschaften E.V. Method and apparatus for determining the thermal sensitivity of the human peripheral nervous system
DE3821219C1 (it) * 1988-06-23 1989-08-24 Phywe Systeme Gmbh, 3400 Goettingen, De
US5060657A (en) * 1990-06-21 1991-10-29 Teague Robert A Hemispherical neurocalograph

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3274995A (en) * 1963-07-09 1966-09-27 Eidus William Thermoelectric dental probe
EP0364158A1 (en) * 1988-10-11 1990-04-18 Ici Americas Inc. Tactile discrimination device and its use in assessing neurological function
EP0428125A1 (en) * 1989-11-16 1991-05-22 FIDIA S.p.A. Device for performing diagnostic tests on the sensitivity to thermal stimuli

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2844175A1 (fr) * 2002-09-05 2004-03-12 Marie Souffrant Dispositif pour tester la sensibilite thermique d'un patient
WO2005018452A1 (de) * 2003-07-24 2005-03-03 Michael Schweers Vorrichtung und verfahren zur messung sensibler störungen unter berücksichtigung verschiedener unweltbedingungen
EP2312999A4 (en) * 2008-07-17 2013-01-09 Electronic Products Accessories And Chemicals Llc DEVICE FOR DIAGNOSING NEUROPATHIES
US9610039B2 (en) 2008-07-17 2017-04-04 Prosenex, LLC Hand-held neuroscreening device
WO2017046735A1 (en) * 2015-09-16 2017-03-23 Meteda S.R.L. Apparatus for the evaluation of the discrimination and heat sensitivity in diabetes patients

Also Published As

Publication number Publication date
US5373853A (en) 1994-12-20
ITMI920481U1 (it) 1993-11-15
IT226580Z2 (it) 1997-06-24
ITMI920481V0 (it) 1992-05-15

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